Ultrahigh pressure ball valve

Abstract

The utility model belongs to the technical field of stop valves, and relates to an ultrahigh-pressure ball valve which comprises a tubular valve body, a connecting pipe is arranged on one side of the valve body, an installation hole is formed in the upper side of the valve body, a valve rod seat is connected to the installation hole, a valve rod connected with a valve element is rotationally arranged in the valve rod seat, and a valve core is arranged in the valve rod seat. A valve rod check ring for limiting the rotating angle of the valve rod is fixed to the bottom of the valve rod seat, the bottom of the valve rod seat is sleeved with an annular rib piece, the two sides of the annular rib piece are bent downwards to form an arc-shaped structure, and the bottom face of the annular rib piece and the peripheral face of the valve body form an attached welding face. The inner circumferential face of the annular rib piece and the inner circumferential face of the installation hole are both attached to the outer circumferential face of the valve rod base in a welding mode, and the attached welding faces form a fixing structure through welding. According to the ultrahigh pressure ball valve provided by the utility model, the loading capacity of the valve rod seat can be increased, so that the safety is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of ball valves, and relates to an ultra-high pressure ball valve. Background Technology

[0002] A ball valve is a common and widely used type of valve. It generally consists of a valve body, a valve core, and a valve stem. When in use, the valve core is rotated by the valve stem to change the connection state of the valve cavity inside the valve body, thereby controlling the pipeline passage.

[0003] Chinese utility model CN220749099U (publication date: 2024-04-09) discloses a split-type ball valve, including a valve body and a valve core. A valve stem is connected to the valve core to drive the valve core to rotate and switch the valve body's communication state. The upper side of the valve body is provided with a mounting hole, and a split-type valve stem mounting seat is connected to the mounting hole. The valve stem is rotatably disposed in the valve stem mounting seat, and its lower end passes through the mounting hole and connects to the valve core. A reduced-diameter inner edge ring is provided at the bottom of the mounting hole, and the inner edge ring abuts against the bottom of the valve stem mounting seat. An expanded-diameter mounting groove is provided at the bottom of the valve stem mounting seat. The inner edge ring and the mounting groove form a retaining ring mounting cavity, and a limiting retaining ring is installed in the retaining ring mounting cavity to limit the rotation angle of the valve stem.

[0004] The ball valves described above can meet the needs of general applications, but when used in ultra-high pressure systems, such as the new refrigerant R744 (CO2) system with an ultra-high pressure of 13 MPa, the pressure-bearing capacity of the valve stem seat may be challenged. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing an ultra-high pressure ball valve that increases the pressure-bearing capacity of the valve stem seat, thereby improving safety.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0007] An ultra-high pressure ball valve includes a tubular valve body with a connecting pipe on one side and a mounting hole on the upper side. A valve stem seat is connected to the mounting hole, and a valve stem connected to a valve core is rotatably mounted inside the valve stem seat. A valve stem retaining ring that limits the rotation angle of the valve stem is fixed at the bottom of the valve stem seat. An annular rib is fitted at the bottom of the valve stem seat, and the two sides of the annular rib are bent downward into an arc shape. The bottom surface of the annular rib is welded to the outer circumferential surface of the valve body. The inner circumferential surface of the annular rib and the inner circumferential surface of the mounting hole are welded to the outer circumferential surface of the valve stem seat. The welded surfaces are all fixed by welding.

[0008] In the aforementioned ultra-high pressure ball valve, the annular rib is formed by bending a circular ring downwards, and each part of the annular rib has the same thickness and the same curvature as the valve body.

[0009] In the aforementioned ultra-high pressure ball valve, the ratio of the thickness of the annular rib to the wall thickness of the valve body is 0.5-1, and the annular rib's width is greater than the valve body's wall thickness.

[0010] In the aforementioned ultra-high pressure ball valve, the material of the annular rib is the same as that of the valve body and valve stem seat, such as brass, carbon steel, or stainless steel.

[0011] In the aforementioned ultra-high pressure ball valve, the bottom of the valve stem seat is provided with an expanded diameter retaining ring mounting groove, the upper surface of the valve stem retaining ring is welded to the top surface of the retaining ring mounting groove, and the outer peripheral surface of the valve stem retaining ring is welded to the inner peripheral surface of the retaining ring mounting groove.

[0012] In the aforementioned ultra-high pressure ball valve, a reduced-diameter inner ring is provided at the bottom of the mounting hole. The inner ring is in contact with the valve stem seat and the valve stem retaining ring. The upper surface of the inner ring is in close contact with the bottom surface of the valve stem seat and the valve stem retaining ring.

[0013] In the aforementioned ultra-high pressure ball valve, the inner diameter of the retaining ring mounting groove is smaller than the inner diameter of the retaining ring, and the inner diameter of the retaining ring is smaller than the inner diameter of the inner edge ring; the inner diameter of the retaining ring is calculated only for the inner diameter of the annular structure.

[0014] In the aforementioned ultra-high pressure ball valve, the welding operation of the mating welding surface is completed simultaneously through furnace welding.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This invention provides an ultra-high pressure ball valve. Based on existing split-type ball valves, it adds annular ribs and uses a double-sided welded structure with an arc-shaped transition to fix the valve body and valve stem seat, significantly improving the pressure-bearing capacity and deformation resistance of the valve stem seat, reducing the stress concentration factor, and thus increasing the pressure resistance limit of existing ball valves. Furthermore, the annular ribs of this invention are integrally welded with other welding surfaces simultaneously via furnace welding, eliminating the need for additional processes. This invention is particularly suitable for use in ultra-high pressure 13 MPa systems using the new refrigerant R744 (CO2). Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is an axial sectional view of the present invention;

[0019] Figure 3 This is an exploded view of this utility model;

[0020] Reference numerals in the attached drawings: 1. Valve body; 2. Connecting pipe; 3. Mounting hole; 4. Valve stem seat; 5. Valve stem; 6. Valve stem retaining ring; 7. Annular rib; 8. Retaining ring mounting groove; 9. Inner edge ring. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0022] An ultra-high pressure ball valve includes a tubular valve body 1, a connecting pipe 2 on one side of the valve body 1, a mounting hole 3 on the upper side of the valve body 1, a valve stem seat 4 connected to the mounting hole 3, a valve stem 5 rotatably mounted inside the valve stem seat 4 and connected to a valve core, a valve stem retaining ring 6 fixed at the bottom of the valve stem seat 4 to limit the rotation angle of the valve stem 5, an annular rib 7 sleeved at the bottom of the valve stem seat 4, the two sides of the annular rib 7 being bent downward into an arc structure, the bottom surface of the annular rib 7 forming a welded surface with the outer peripheral surface of the valve body 1, the inner peripheral surface of the annular rib 7 and the inner peripheral surface of the mounting hole 3 forming a welded surface with the outer peripheral surface of the valve stem seat 4, and the welded surfaces forming a fixed structure by welding.

[0023] The assembly and use process of this embodiment is as follows: First, valve body 1, valve stem seat 4, valve stem 5, valve stem retaining ring 6, annular rib 7, and valve core are produced separately. Then, valve stem retaining ring 6 is placed at the bottom of valve stem seat 4. Next, valve stem seat 4 is placed into the mounting hole 3 of valve body 1. Then, annular rib 7 is fitted onto valve stem seat 4 and moved downwards until it fits against valve body 1. By welding the various fitting surfaces, valve body 1, valve stem seat 4, annular rib 7, and valve stem retaining ring 6 are firmly connected as one unit. Finally, valve stem 5 is passed through valve stem seat 4 and simultaneously connected to valve core. Within the limiting range of valve stem retaining ring 6, valve stem 5 is rotated, and valve core rotates accordingly. The orientation of the through hole in valve core changes, thereby changing the communication state of valve body 1.

[0024] Preferably, in order to make the annular rib 7 fit more closely to the valve body 1 and reduce the stress concentration factor, the annular rib 7 is formed by bending a ring downwards, and each part of the annular rib 7 has the same thickness and the same curvature as the valve body 1.

[0025] To ensure welding strength, the thickness of the annular rib 7 is 0.5-1 to the wall thickness of the valve body 1, and the annular width of the annular rib 7 is greater than the wall thickness of the valve body 1.

[0026] Preferably, the material of the annular rib 7 is the same as that of the valve body 1 and the valve stem seat 4, such as brass, carbon steel or stainless steel.

[0027] In this embodiment, the specific welding structure of the valve stem retaining ring 6 is as follows: the bottom of the valve stem seat 4 is provided with an enlarged diameter retaining ring mounting groove 8, the upper surface of the valve stem retaining ring 6 and the top surface of the retaining ring mounting groove 8 form a close-fitting welding surface, and the outer peripheral surface of the valve stem retaining ring 6 and the inner peripheral surface of the retaining ring mounting groove 8 form a close-fitting welding surface.

[0028] In this embodiment, in order to ensure the structural integrity, an axial limiting structure is further added. Specifically, the bottom of the mounting hole 3 is provided with a reduced-diameter inner ring 9, which is in contact with the valve stem seat 4 and the valve stem retaining ring 6. The upper surface of the inner ring 9 and the bottom surface of the valve stem seat 4 and the valve stem retaining ring 6 are both in close contact and welded.

[0029] To ensure the valve stem 5 rotates flexibly, the inner diameter of the retaining ring mounting groove 8 is smaller than the inner diameter of the retaining ring, and the inner diameter of the retaining ring is smaller than the inner diameter of the inner edge ring 9; the inner diameter of the retaining ring is calculated only for the inner diameter of the annular structure.

[0030] The welding method in this embodiment is as follows: the welding operation of the bonding welding surfaces is completed simultaneously through furnace welding.

[0031] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. An ultra-high pressure ball valve, comprising a tubular valve body (1), a connecting pipe (2) provided on one side of the valve body (1), a mounting hole (3) provided on the upper side of the valve body (1), a valve stem seat (4) connected to the mounting hole (3), a valve stem (5) rotatably disposed within the valve stem seat (4) and connected to a valve core, and a valve stem retaining ring (6) fixed at the bottom of the valve stem seat (4) to limit the rotation angle of the valve stem (5), characterized in that, The bottom of the valve stem seat (4) is fitted with an annular rib (7). The two sides of the annular rib (7) are bent downward into an arc shape. The bottom surface of the annular rib (7) is welded to the outer circumferential surface of the valve body (1). The inner circumferential surface of the annular rib (7) and the inner circumferential surface of the mounting hole (3) are welded to the outer circumferential surface of the valve stem seat (4). The welded surfaces are all fixed by welding.

2. The ultra-high pressure ball valve according to claim 1, characterized in that, The annular rib (7) is formed by bending a circular ring downwards, and each part of the annular rib (7) has the same thickness and the same curvature as the valve body (1).

3. The ultra-high pressure ball valve according to claim 1, characterized in that, The ratio of the thickness of the annular rib (7) to the wall thickness of the valve body (1) is 0.5-1, and the annular width of the annular rib (7) is greater than the wall thickness of the valve body (1).

4. The ultra-high pressure ball valve according to claim 1, characterized in that, The material of the annular rib (7) is the same as that of the valve body (1) and the valve stem seat (4).

5. The ultra-high pressure ball valve according to claim 1, characterized in that, The bottom of the valve stem seat (4) is provided with an enlarged diameter retaining ring mounting groove (8), the upper surface of the valve stem retaining ring (6) and the top surface of the retaining ring mounting groove (8) are fitted and welded together, and the outer peripheral surface of the valve stem retaining ring (6) and the inner peripheral surface of the retaining ring mounting groove (8) are fitted and welded together.

6. The ultra-high pressure ball valve according to claim 1, characterized in that, The bottom of the mounting hole (3) is provided with a reduced inner edge ring (9). The inner edge ring (9) is in contact with the valve stem seat (4) and the valve stem retaining ring (6). The upper surface of the inner edge ring (9) and the bottom surface of the valve stem seat (4) and the valve stem retaining ring (6) are both in close contact and welded.

7. An ultra-high pressure ball valve according to any one of claims 1-6, characterized in that, The welding operation of the bonding surfaces is completed simultaneously through furnace welding.

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